1 Answer from the Community

1. You can use the Thunderbolt cable to connect your iMac and your MacBook Pro

2. You can use the iMac as a secondary display for your MacBook Pro provided you put your iMac into Target Display Mode. This is documented by Apple - please search for "Use your iMac as a display with Target Display Mode"

3. You cannot use the MacBook Pro display as a secondary display for the iMac. The MacBook Pro does not offer Target Display Mode.

If you would like to use the MacBook Pro internal screen as a secondary display for the iMac, your only route would be by way of a software/network solution like ScreenRecycler.